only compile/link with libpam if pam headers are also available
only compile/link with libpam if pam headers are also available

ellert/globus-toolkit,gridcf/gct,globus/globus-toolkit,ellert/globus-toolkit,ellert/globus-toolkit,globus/globus-toolkit,globus/globus-toolkit,gridcf/gct,ellert/globus-toolkit,globus/globus-toolkit,globus/globus-toolkit,gridcf/gct,globus/globus-toolkit,gridcf/gct,globus/globus-toolkit,gridcf/gct,globus/globus-toolkit,ellert/globus-toolkit,gridcf/gct,ellert/globus-toolkit,ellert/globus-toolkit,ellert/globus-toolkit